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Business Combinations Pro Forma Information (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
SCB Bancorp [Member] |  |
Business Acquisition [Line Items] |  |
Business Acquisitions Pro Forma Net Interest Income | $ 123,161 | $ 105,925
Business Acquisitions Pro Forma Provision For Loan Losses | 8,667 | 7,462
Business Acquisitions Pro Forma Non-Interest Income | 52,257 | 47,719
Business Acquisitions Pro Forma Non-Interest Expense | 112,246 | 100,933
Business Acquisitions Pro Forma Income before Income Taxes | 54,505 | 45,249
Business Acquisitions Pro Forma, Income Tax Expense | 12,711 | 16,352
Business Acquisition, Pro Forma Net Income (Loss) | $ 41,794 | $ 28,897
Pro Forma Earnings Per Share |  |
Business Acquisition, Pro Forma Earnings Per Share, Basic | $ 2,670 | $ 2,080
Business Acquisition, Pro Forma Earnings Per Share, Diluted | $ 2,670 | $ 2,080
Weighted Average Basic Shares Outstanding, Pro Forma | 15,646,359 | 13,862,230
Pro Forma Weighted Average Shares Outstanding, Diluted | 15,659,818 | 13,867,105
First BancTrust [Member] |  |
Business Acquisition [Line Items] |  |
Business Acquisitions Pro Forma Net Interest Income | $ 117,450 | $ 110,990
Business Acquisitions Pro Forma Provision For Loan Losses | 8,867 | 8,365
Business Acquisitions Pro Forma Non-Interest Income | 36,526 | 34,060
Business Acquisitions Pro Forma Non-Interest Expense | 94,464 | 94,843
Business Acquisitions Pro Forma Income before Income Taxes | 50,645 | 41,842
Business Acquisitions Pro Forma, Income Tax Expense | 12,456 | 15,849
Business Acquisition, Pro Forma Net Income (Loss) | $ 38,189 | $ 25,993
Pro Forma Earnings Per Share |  |
Business Acquisition, Pro Forma Earnings Per Share, Basic | $ 2,600 | $ 1,830
Business Acquisition, Pro Forma Earnings Per Share, Diluted | $ 2,590 | $ 1,830
Weighted Average Basic Shares Outstanding, Pro Forma | 14,704,888 | 14,175,559
Pro Forma Weighted Average Shares Outstanding, Diluted | 14,721,708 | 14,180,434

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